He strongly recommended that i ___ that route through the mountains.A.didn't take  B.musn't take   C.not took   D.not take  为什么不选B而选D?This time tomorrow ,i ___ on the beach ,enjoying the sunshine!A.am sitting      B.sit     C.would sit      D.will be sitting   为什么C错 

第一题、这是recommend的虚拟，具体形是recommendthatshould动原（其中should可以省略），所以是D。第二题、根据前三个词‘明天的这个时候’，表明为将来进行时，形式为willdoing。望采纳！

recommend建议，后面用虚拟 即should+动词原型。should 可省略。本句就 是这样。
will be doing是将来进行时。this time tomorrow明天的这个时候。根据句意用这个时态。
would sit是过去时。没有这个时间状语。

He strongly recommended that i ___ that route through the mountains.
A.didn't take B.musn't take C.not took D.not take
recommend 推荐、劝告 后加that 引导的虚拟语气,从句谓语要用（should）+动词原形,否定（should）not + 动词原形 ,should可省略,所以选D.
他强烈地劝说我不要采取那条路线通过这些山.
This time tomorrow ,i ___ on the beach ,enjoying the sunshine!
A.am sitting B.sit C.would sit D.will be sitting
时间状语是明天的这个时候,将来时间的具体某个时间点,用将来进行时,would sit 是过去将来时.